If the order is "Reload - Stop" to the right of the URL/Address bar you will get a combined "Reload/Stop" button. Drag one button to switch the order to have separate buttons to the right of the URL/Address bar.

Separate them otherwise to get two distinct buttons (drag a separator, space, or flexible space from the Customize window between the two buttons).

You can also use the F5 or CTRL+F5 keyboard shortcuts to reload the page.